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Definitions of 21st
  1. adjective
    coming next after the twentieth in position

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Definition that contains 21st
  • u the 21st letter of the Roman alphabet
  • sin the 21st letter of the Hebrew alphabet
  • arthur elected vice president and became 21st President of the United States when Garfield was assassinated (1830-1886)
  • phi the 21st letter of the Greek alphabet
  • chester alan arthur elected vice president and became 21st President of the United States when Garfield was assassinated (1830-1886)
  • trisomy 21 a congenital disorder caused by having an extra 21st chromosome; results in a flat face and short stature and mental retardation
  • down syndrome a congenital disorder caused by having an extra 21st chromosome; results in a flat face and short stature and mental retardation
  • mongolism a congenital disorder caused by having an extra 21st chromosome; results in a flat face and short stature and mental retardation
  • y2k compliant prepared to accurately process date and time data between and into the 20th and 21st centuries
  • down's syndrome a congenital disorder caused by having an extra 21st chromosome; results in a flat face and short stature and mental retardation
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